PARLATORIA ZIZYPHI. 149 



black, moulted skin of the second-stage female, with a 

 narrow white or brownish -white supplementary secre- 

 tion, which at the posterior extremity is sometimes 

 extended, and forms about one fourth of the length of 

 the puparium ; usually, however, there is a very narrow 

 secretionary supplement, and sometimes it is entirely 

 wanting. Larval exuviae usually project beyond the 

 anterior margin ; opaque black and sometimes has a 

 dorsal carina, and when quite perfect covered with 

 a delicate transparent secretion. Second exuviae rect- 

 angular, angles rounded ; finely rugose ; posterior 

 margin frequently with a central projection ; dorsum 

 usually has a deep, broad, longitudinal furrow with a 

 faint carina at the bottom. Sometimes several trans- 

 verse carinae arise from the margin, but their number 

 and position are extremely variable. The thin secre- 

 tionary covering is white and semi-transparent, and is 

 usually present in young adults ; but in the old examples 

 it is almost invariably worn away. When present it 

 gives the exuviae a greyish appearance. 



Ventral scale complete ; is composed of secretionary 

 matter, and is of a pale brownish colour or white. It 

 is attached to the margins of the moulted skin of the 

 second- stage female ; and on its removal exposes the 

 whole ventral surface of the dorsal exuviae, which have 

 a highly polished surface. 



Long. 1*25 2 mm. 



Adult female (PL XXX, fig. 8) after treatment with 

 potash short ovate, cephalic segment well defined and 

 bears, near its articulation, a large projecting tubercle 

 which is furnished towards the apex with a minute 

 spine. Rudimentary antennas, with a long slender 

 spine, are placed rather closely together immediately 

 above the rostrum. The rostral filaments are rather 

 long and extend to the second free abdominal segment. 

 Margins of free abdominal segments with short tubular 

 spinnerets; and there is a small spine at the com- 

 mencement of the first. Pygidium (PI. XXXIII, fig. 

 3) with four groups of circumgenital glands ; the 



